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Chapter 4: Q3DQ (page 1012)
In Figure below, if coil is turned so that its axis is vertical,
does the mutual inductance increase or decrease? Explain.
Answer
The mutual inductance is decrease
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When is a 1.5 - VAAA battery not actually a 1.5 - V battery? That is, when do this its terminals provide a potential difference of less than 1.5 V ?
High-voltage power supplies are sometimes designed intentionally to have rather large internal resistance as a safety precaution. Why is such a power supply with a large internal resistance safer than a supply with the same voltage but lower internal resistance?
(a) At room temperature, what is the strength of the electric field in a
12-gauge copper wire (diameter ) that is needed to cause a
current to flow? (b) What field would be needed if the wire were made of silver
instead?
Copper has free electrons per cubic meter. A 71.0-cm
length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 A of
current. (a) How much time does it take for an electron to travel the length
of the wire? (b) Repeat part (a) for 6-gauge copper wire (diameter 4.12 mm)
of the same length that carries the same current. (c) Generally speaking,
how does changing the diameter of a wire that carries a given amount of
current affect the drift velocity of the electrons in the wire?
An electron at pointinFig. E27.15has a speedofFind (a) the magnitude and direction of the magnetic field that will cause the electron to follow the semicircular path fromto, and (b) the time required for the electron to move fromto.
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